Pen



FIG. 1 is a top front perspective view of a pen, showing our new design;

FIG. 2 is a bottom back perspective view thereof;

FIG. 3 is a top elevational view thereof;

FIG. 4 is a left side elevational view thereof, the right sideelevational view being a mirror image thereof;

FIG. 5 is a bottom side elevational view thereof;

FIG. 6 is a front elevational view thereof; and,

FIG. 7 is a back elevational view thereof.

CLAIM The ornamental design for a pen, as shown and described.